js on function on keypress code example
Example: keypress javascript
The keypress event has been deprecated,
you should look to use beforeinput : https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/beforeinput_event
or keydown : https://developer.mozilla.org/en-US/docs/Web/API/Document/keydown_event
instead.
(And don't forget to like answers that help you !)